Effect of redox potential on heavy metal binding forms in polluted canal sediments in Delft (The Netherlands).

Effect of redox potential on heavy metal binding forms in polluted canal sediments in Delft (The Netherlands). Research Abstract Details 

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Effect of redox potential on heavy metal binding forms in polluted canal sediments in Delft (The Netherlands). Abstract Text:

P Kelderman,A A Osman,P Kelderman,A A Osman,

Heavy metal binding forms for Cu, Zn and Pb were determined at four representative sediment sites in the canals of Delft (The Netherlands), using selective chemical extraction methods. Small differences (on average <5%) were found between duplicate extraction experiments. The dominant Cu binding form was always related to sulphide and organics in the sediment. Zn was mainly bound to iron+manganese (hydr)oxides, whereas Pb was rather evenly distributed over the different labile and non-labile binding fractions. A gradual (over about 1 month) increase in redox potentials of the anaerobic sediments led to a 7-37% sediment release of the above heavy metals; this could mainly be ascribed to oxidation of the heavy metal-sulphide bindings. Part of the released heavy metals was re-adsorbed by the labile binding phases ("exchangeable" and "carbonate bound"). Contrary to expectations, we found a decrease rather than an increase in the Fe+Mn (hydr)oxide binding forms. This can probably be ascribed to non-equilibrium reactions in the time span of the experiments, as well as side reactions such as complexation with humic acids and hindered precipitation reactions due to organic matter coatings.

Effect of redox potential on heavy metal binding forms in polluted canal sediments in Delft (The Netherlands). Publishing Authors By Initials

P Kelderman,AA Osman,P Kelderman,AA Osman,

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Effect of redox potential on heavy metal binding forms in polluted canal sediments in Delft (The Netherlands). Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Water research

VOLUME: 41

Page Numbers: 4251-61

Journal Abbreviation: Water Res.

ISSN: 0043-1354

DAY: 6

MONTH: 06

YEAR: 2007

Effect of redox potential on heavy metal binding forms in polluted canal sediments in Delft (The Netherlands). Information

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LANGUAGE: eng

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Grant and Affiliation Information for Effect of redox potential on heavy metal binding forms in polluted canal sediments in Delft (The Netherlands).

AFFILIATION: UNESCO-IHE Institute for Water Education, PO Box 3015, 2601 DA Delft, The Netherlands. p.kelderman@unesco-ihe.org

Country: England

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MEDLINETA: Water Res

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